Carbureting device



Patented July 19, 1928.

* artsv STATES r; orrica; 1

HERBERT WILLIAM sPILLEn, OF LONDON, ENGLAND, AssIeNoN mos. smrrnsc soNs(MOTOR ACCESSORIES) LIMITED, or LoNDoN, ENGLAND, A BRITISH COMPANY;

GARBURETING DEVICE.

Application filed January 4, 1927, Serial No. 158,985,":11111 ill. GreatBritain January 22, 1926. i

I This'invention is for in'iprovei'nents in or relating to carburetlngdevices and has for one of its objects to'facilitate the manufac-vturethereof, and for another object to increase the working efficiency.The invention 18 an improvement In or modification of the,

invention described and claimed in my United States Patent No.1,567,088, and like the carbureting device described in that ficationembodies a duct block having a plurality of ducts for carbureted aireach extending, separately from the others, from' its intake aperture atone end" of the block to its delivery mouth at a restricted portion p pI the invention there willnow be described, byway of example onlyandwithreference 75 of the lateral surface thereof, which portion is,intended to face directly the intake end of the main delivery conduit,say the induction pipe" of an internal-combustion engine. The deliverymouths of the ductsare situ-i ated at different positions alongthe'length of the block and a sleeve valve movably received upon thelateral face of the block is automatically operated 'by'variations inthe pressure in the main delivery conduit to' .move along the block andsuccesslvely cover and uncover the said delivery mouths.

In my co-pendingUnited States applioa tion No. 6,916, filed 5thFebruary, 1925,

thereis'described an improved or modified construction in which each ofthe said ducts substantially extends in a straight or straight pathwithout sharp twists or bends from its intake aperture to its. deliverymouth. I

According to the primary feature of the present invention there isprovided a carbureting device which embodies the advantages described inthe aforesaid specification and which is characterized in that the ductblock, upon the lateral surface of which the sleeve valve is movablyreceived, has extending into its interior a cavity constituting an airintake which is common, and large relatively, to the ducts. Thecarbureting device according to the invention is further characterizedin that the ducts are short (and preferably straight) and lead from the.

ing ofthe block is facilitated and since'the carbureted air only has topass through short ducts the frictionalfresistance to its travel is butsmall and consequently'the carburetor is capable of Working efliciently,even 5 though the carbureted air is being drawn throughit at'a high'ratein order to satisfy large demands by the engine. Y

A convenient construction according to thep resent invention comprises aduct block of general cylindrical formation which has the aforesaid airintake cavity reaching end-f wise into it and has the ducts extendingfrom such cavity to the lateral curvedlsurface of the block. The fuelsupply conduits i may reach transversely into the ducts between theirends. I H

For a more complete understandlng of to the accompanying drawings, oneconstructional form of carburetor-according to' the invention. It is tobe understood,.l1ow-, ever,"that tl'ie invention is'not restrictedto theprecise constructional details set forth. 0A,

l her isiinclicatedat"10, acylindricalduct:

blockat 11, ajca'sing' enclosing thejlatter.

at 12, the int ake end of an internal-3 combustion engine inductionpipeat" 13. This 'pipe is controlled'in the usual way by a throttlevalve whereof the spindle is illustra-ted at 14. The duct block 11 hasan enlargement 15 by which it is carried by the 0 casing 12 and there isattachedto an ex tension 16, reaching downwardly from the duct block, aportion 17 of the casing of the float chamber Mounted to slideautomatically up and down on the cylindrical Surface- 7105 of the ductblock is a valve 18. The con struction of duct block shown has fourducts I 19, 20, 21 and 22 respectively which all lead to a restrictedportion of the lateral surface ofthe duct block 11, namely the surfaceim- 11a mediately opposite to the induction pipe 13.

Inits upward movementthe valve 18 will first commence to uncover theduct 19, then commence.- touncover the duct 20, then commencez'touncover the duct 21 and finally commence to uncover the duct 22, the ar-Reaching half-way into the ducts 19, 20,

21 are vertical. diffuser tubes 23 whichat their, lowerends are arrangedto surround nozzles 24 leading from the float chamber; The lower ends ofthe tubes 23 surround the nozzles 24 in such 'a way as to leave anannular space25 for air. to be drawn in be,

tween'the nozzle and tube so that-the fuel.

' isdelivered into the duct'i'n the form of a mist. The pure air duct 22will be found useful in some circumstances in promoting @the efficiencyof the carburetor but it is not essentialto employ this duct.

Extending upwardly into the duct block 111 is the main air intakecavity26. The

cavity 26, as illustrated, occupies about half the. cross-sectional areaof the duct block and. reaches from the lower end thereof'to the level.of the upper surface of the; duct 22.- The'ducts 19, 20, 21 and 22 canbef brought very close together, but su'flicient,

metal can easily be left between them to permit the ducts to belformedbycasting.

The general direction of' the ducts is substantially that of theadjacent part 'of the induction pipe 13. ,The cavity 26 is quite largeand permits ample supplies of airto reach the intake ends of the ductsand it will beappreciate'd that there need hey no sharp bends or twiststo impede the travel of the carbureted air; I v

I, claims-e 1 1'. In, a carbureting device, the combination of a suctionchamber having a delivery passage one side thereof, a duct block in. thechamber, a-cavity extending into the duct v block, of relatively largecross 'sectional area and constituting an air intake, av plurality ofseparate short straight. ducts each of relatively small cross-sectionalarea, each extending through said duct-block;

from the cavity to the suction chamber in alignment with. the salddelivery passage therefrom andv a suction-operated. valve movable on theductblock to cover and un-] coverthe delivery mouths successively. 2. Ina carburetingdevice the combina- 'tion of a suction chamber having adelivery outlet at one side thereof, a duct-block in said chamber, aplurality of short and substantially straight ducts in the blockextendingfeach separately from the othersfrom a cavity extending intothe interiorvof the block and constituting an air intake which is commonto all the ducts and with which i the intake apertures of the ductscommunicate, to a delivery mouth openmg 1n a restricted portion of thelateral surface of the block and a suction-operated valve-movable on theblock to cover and uncover the said delivery mouths successively.

3. In a carbureting device the combination of asubs'tantiallycylindrical suction chamber, whereof one end is closed and an other. endis open, having'a restricted de livery out-let at. one side thereof, acylindri:

cal duct-block extending into the chamber through its open end, aplurality of short and substantially straight ducts in the blockextending each separately from the others from a cavityclosed atone endand extend ing end'wise'into the block constituting an air intake which1s common to all the ducts and, with which the intake apertures oftheducts communicate, to a delivery mouth situ-; atedopposite therestricted delivery outlet of the suction chamber, an upstanding guidingmember located upon the duct-block, a.

suction-operated sleeve-valve movableon the cluct block and gulded bysaid guiding mem-, her to cover and uncover successively thedeliverymouths of said ducts,vdiffuser tubes one for each duct extendingeach vertically into the respective duct transversely ofthe axis of the.duct and fuel supply means common to all of said diffuser tubes andinclud ing a: constant level fuel chamber.

In testimony whereof I affixmy signature,

HERBERT WILLIAM SPILLER',

